if(document.documentElement.scrollTop){
document.documentElement.scrollTop=value;
}else{
document.body.scrollTop=value;
}
}
window.onscroll=function(){getScrollTop()>0?obj.style.display="":obj.style.display="none";
var h=document.body.scrollHeight - getScrollTop() - obj.offsetTop - obj.offsetHeight;
obj.style.bottom=0+"px";
if(h<350){
obj.style.bottom=340+"px";
obj.style.top="auto";
}
}
obj.onclick=function(){
var goTop=setInterval(scrollMove,10);
function scrollMove(){
setScrollTop(getScrollTop()/1.1);
if(getScrollTop()<1)clearInterval(goTop);
}
}
}